JPS62204416A - Composite magnetic head - Google Patents

Abstract

PURPOSE:To simplify production and to enable high-density recording- reproduction by forming a write-read head core and an erasing core, then forming the groove of a narrow track, and embedding a nonmagnetic substance in the groove. CONSTITUTION:The write-read gap 3 is formed on the first magnetic substance core 1 in the form of a block or a bar, and the first magnetic substance core 1 and the second magnetic substance core 2 are welded by high-m.p. glass 17. The groove of the narrow track is formed on the integrated first magnetic substance core 1 and the second magnetic substance core 2 so that the width of the reproducing track is controlled to TW1. Then a couple of thin platy spacers 4 and 5 are bonded by a resinous adhesive or low-m.p. glass and embedded in the groove. Under such conditions, the material is sliced and ground to form a write-read magnetic head having the prescribed core width. An erasing head is formed in the same way with the third magnetic substance cores 7 and 7', erasing gaps 9 and 10, the fourth magnetic substance cores 8 and 8', spacers 11-13, and high-m.p. glass 18.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite magnetic head that can easily perform high-density recording and reproduction.

[Conventional technology]

FIG. 7 is a plan view showing the sliding surface of a conventional composite magnetic head disclosed in, for example, Japanese Patent Laid-Open No. 58-189817, and FIG. 8 is a perspective view showing the entire structure.

At both ends, Qli has a magnetic core that forms a magnetic path for recording and reproducing, and the gradient has a magnetic core that forms a magnetic path for recording and reproducing similarly to the magnetic core, and a groove for the winding (2). The almost T-shaped magnetic core is formed, and the wire is made of a non-magnetic material such as glass.The writing-reading gap is omitted. A magnetic core formed by a magnetic path, (A) is a nearly T-shaped magnetic material that forms a magnetic path for tunnel erasure and has grooves for windings, similar to this magnetic core (foundation). The core, (c), @ is the erase gap made of non-magnetic material such as glass, α
4 is a magnetic core that forms a closed magnetic path for recording and reproducing, (to) a magnetic core that forms a closed magnetic path for tunnel erasing, (
6), αQ is a recording device consisting of a magnetic core I21j, a plane, a reading gap wire, a magnetic core α4, and a winding wire.
Magnetic circuit for reproduction, magnetic core, (a), erasure d!
Yatsupu hook.

(c), consisting of a non-magnetic material such as ceramic or glass attached to prevent magnetic interference between the magnetic core (to) and the magnetic circuit for tunnel erasure consisting of the winding (e). It is a spacer.

[Problem that the invention seeks to solve]

In the conventional magnetic head shown in Figs. 7 and 8, both magnetic cores 3]) and (a) are each formed into a bar state and are separately machined with narrow track grooves, and then the grooved tips are 2. Butt the parts together and place both outside the glass. By welding at the trunk, a predetermined playback track width (TW3) is formed. For that, a magnetic core? ])) When setting the metal wire to the butt jig, or when welding it to the glass, the 9th
In the figure, track misalignment as shown in the figure is likely to occur, and the magnetic core Q1.

Extremely strict dimensional accuracy is required when machining plow grooves.

In addition, there is a problem similar to that described above regarding track alignment of the magnetic cores (2) and (e), and the predetermined recording track @
('I'W4) and erase track width ('1'W5).

(1'W6) was extremely difficult to obtain with high precision.Furthermore, a magnetic core? When joining the assembly consisting of υ, (c) and the assembly consisting of the magnetic core, with glass or epoxy resin, etc. through the spacer (6), the standards for joining are not clear. Another problem is that the reproduction track and the recording track tend to be misaligned. Furthermore, since the glass it -Oi is exposed on the recording medium sliding surface of the composite magnetic head, there is a risk that the recording medium may be damaged by air bubbles generated during glass welding (which cannot be completely eliminated using current technology).

Next, FIG. 10 is a plan view showing the sliding surface of another conventional composite magnetic head, which consists of a magnetic core (c), a write-read gap (to), and a non-magnetic material such as ceramic. A recording/reproducing core chip constituted by a spacer (to), a magnetic core (b), αp, and (to).

Two erasing core chips constituted by Oa, erasing gap (to), (to), and spacers QO and H made of non-magnetic material such as ceramic, form a magnetic circuit for recording and reproduction and a magnetic circuit for erasing, respectively. has been done. In addition,
Since the windings and magnetic core are almost the same as those of the Mouse and Q4 shown in FIG. 8, their explanation will be omitted. In addition, FIGS. 11 and 12 are the C-α line and D in the direction of the arrow in FIG. 10, respectively.
-1yill is a cross-sectional view.

The magnetic head shown in FIG. 10 above is a magnetic head generally referred to as laminate tights, and is composed of one thin recording/reproducing core and two erasing cores as described above. Therefore, there is a limit to thinning the core tick from the viewpoint of processing yield for increasing the TPI of 135 TPI at present or 192 TPI in the future, that is, for high-density recording and reproduction. Furthermore, since the reproducing track width and the recording track width are the same size, there will be unerased data on the outside of each track. This is particularly noticeable on the innermost circumferential side of the recording medium, and is disadvantageous in terms of the S/N ratio. Further, due to the thinning of the wall, there was a problem that the core effective group of each magnetic material was reduced.

This invention was made to solve the above-mentioned problems, and while taking advantage of the good recording and reproducing efficiency of the conventional magnetic core as shown in Figs. 7 and 8, it A track width with u=M degrees can be easily obtained;
Another object of the present invention is to obtain a composite magnetic head capable of recording and reproducing data at a learning density without exposing the crow to the medium sliding surface of the composite magnetic head.

[Means for solving problems]

In the Shinkin magnetic head according to the present invention, after forming a recording/reproducing or erasing gap in a nearly single-shaped magnetic core in a block state (or bar-like p4) by vapor deposition or sputtering, The same as the type abrasive core (approximately 1-shaped magnetic core in a flocked state is welded and joined, and then a narrow track M process is applied to the two magnetic cores to obtain a predetermined track width. Next, a non-magnetic material such as ceramic is bonded to the processed groove using a resin adhesive or low melting point glass, and the recording/reproducing core processed as described above is bonded with a non-magnetic material such as ceramic. The body is sandwiched and joined using resin thread adhesive, etc., and then sliced and polished to a predetermined thickness.

[Effect]

In the composite magnetic head of this invention, the nearly single-shaped magnetic core and the nearly T-shaped magnetic core are integrally processed into a narrow track at the same time, so there is no deviation in the track width of the two magnetic cores. , and the dimensional accuracy of the track width is dramatically improved.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. iI
1 is a plan view showing the parking surface of the bonded magnetic head of the present invention, and FIG. 2 is a perspective view showing the entire structure. In both figures, (
1) is a substantially single-shaped first magnetic core that forms a magnetic path for recording and reproducing, and (2) is this first Tli magnetic core (1).
), the almost T-shaped second magnetic core is provided with a groove for the winding α and forms a magnetic recording path, and (3) is a magnetic core made of a non-magnetic material such as glass. - Reading gap, (4
) t (5) is a pair of spacers made of a non-magnetic material such as ceramic; (6) is a spacer made of a non-magnetic material such as ceramic to prevent magnetic interference between the recording/reproducing core and the erasing core; (7') is an integrated almost single-shaped third magnetic core that forms a magnetic path for erasing; (8), (δ'
) is a substantially T-shaped fourth magnetic core that forms an erasure magnetic path and is integrated with a winding groove, (9), (I
Q is an erase gap made of a non-magnetic material such as glass. Alpha power.

(6), Q3 is a spacer made of a non-magnetic material such as ceramic, α◆ is a magnetic core that forms a closed magnetic path for recording and reproducing, and Q is a magnetic material that forms a closed magnetic path for tunnel erasing. The core αQ is a spacer made of a non-magnetic material such as glass or ceramic provided for the same purpose as the spacer (6), and these magnetic cores α4. (G) and the spacer ring are bonded and integrated with a resin adhesive or glass. Alpha power is the writing-reading gap (3)
The first magnetic core (1) and the second magnetic core (
2) and high melting point glass for melting M-bonding, (lI8 is the magnetic core (7), (7') and (8).

(8') is a high melting point glass that is welded and joined to form an erase gap (9), (IQ).

In FIGS. 1 and 2 above, after forming a write-read gap (3) in the first magnetic core (1) in a block state (or bar state) by vapor deposition or sputtering, the first magnetic material Core (1) and second magnetic core (2
) are welded and joined with high melting point glass αη.

Next, the integrated first magnetic core (1) and second Wi magnetic core (2) are grooved to have a narrow track so as to have a predetermined reproduction track width (TWl). Next, a pair of thin plate-shaped spacers (4) and (5) are bonded to the grooves using a resin adhesive or low melting point glass.

Note that the spacer (g, (5)) may be buried by pressurized injection of paste-like resin or ceramic.Also, if the problem of air bubbles is solved, it may be filled with glass. Next, in this state, the core is sliced and polished to obtain a predetermined core width, thus forming a write-read magnetic head core.Similarly, a third magnetic core (
7)! (7'), erase gap (9), αO1 fourth magnetic core (s) + (8'), spacer aυ,
(A), o3, and high-melting point glass Q8 each constitute an erasing head. Next, the write/read magnetic head core and the erase head core are bonded with a resin adhesive, glass, etc. with a spacer (6) in between, and a winding 04. - are respectively inserted 8, thereby forming a closed magnetic path of the writing magnetic head core by the magnetic core α4 and a closed magnetic path of the erasing head core by the magnetic core α4, thereby forming a composite magnetic field according to the present invention. The head is configured.

Note that the spacer (4, (6)) may not be embedded in the magnetic head core, but may be provided on one slider side made of a non-magnetic material such as ceramic.Similarly, the spacer (5)
, α3 may be provided on the other slider side. Also, each spacer (4) x (5), (6n, 0η, stem.

A3 is integrally formed and provided on the side of the box-shaped Herad slider, and the first magnetic core (1) and the second magnetic core are simply grooved.
A write-read magnetic head core consisting of a magnetic core (2) and a write-read gap (3) is inserted and joined, and the same magnetic core (7) t (7') and magnetic core (8') are inserted and bonded.
, (8′ insertion erase gap (9) + m) inserting and joining the erase head core into the henodomerider;
The bonded magnetic head of the present invention may also be constructed.

In addition, in FIG. 1, the pressure between the reproduction track width (TWl) and the recording track width (TW2) is (TW1≧TW2).
This prevents deterioration of the S/N ratio due to unerased written data, which was a problem with the conventional magnetic head shown in FIG.

Further, Figs. 3 and 4 are respectively shown in the direction of the arrow A- in Fig. 1.
These are cross-sectional views taken along lines A' and B-8', and since these magnetic head cores have a shape with low magnetic resistance and high core efficiency, high-density recording and reproducing can be easily performed. Also,! ! 5 and 3 are modified sectional views of FIGS. 3 and 4, respectively, and have the same effects and advantages as described above.

〔Effect of the invention〕

As described above, according to the present invention, after forming a write-read head core and an erase head core using two magnetic cores, a narrow track groove is formed, and a non-magnetic material such as ceramic is buried in the groove. With this configuration, although the accuracy of the track width is high and the widths of the writing-reading gap and the erasing gap can be made very small, there is no need to reduce the width of the magnetic core itself. In addition, the sliding surface of the composite magnetic head is smooth,
In addition, when ceramic with good wear resistance is used, the reliability of sliding against the distribution medium is further improved. This makes manufacturing simple and enables extremely high-density recording and reproduction.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a composite magnetic head according to an embodiment of the present invention, FIG. 2 is a perspective view showing the entire structure, FIGS.
The figures are a sectional view taken in the direction of the arrow in Fig. 1, Fig. 5,
FIG. 3 is another sectional view, FIG. 7 is a plan view showing a conventional composite magnetic head, FIG. 8 is a perspective view showing the whole, and FIG.
10 is a plan view showing another conventional composite magnetic head, and FIGS. 11 and 12 are cross-sectional views taken in the direction of the arrow in FIG. 10. It is. In the figure, (1) is the first magnetic core, (2) is the second magnetic core, (3) is the writing-reading gap, (4), (5), (
6) is a spacer, (7) and (7') are third magnetic cores,
(8), (8') is the 4i-like body core, (9), ◇O
is the elimination gap, α depletion, (6). (to) is a spacer, a◆, 0 is a magnetic core, (IQ is a spacer, α is, (to) is glass, and 鵠 and 翰 are windings. In addition, the same symbols in each figure are the same or equivalent. The parts are shown. Agent: Masaru Sato, Patent Attorney Figure 1, Figure 5, Figure 1, 11-piece core of the first stone, Figure 3

Claims (1)

[Claims] First and second magnetic cores forming a write-read magnetic head core and a write-reader formed between the first and second magnetic cores for recording or reproducing information on a recording medium.
a read gap, a pair of spacers embedded in grooves formed on both sides of the first and second magnetic cores and regulating the write-read gap to a predetermined width; and erase recording on the recording medium. a pair of third and fourth magnetic cores forming an erase magnetic head core;
and a pair of erase gaps formed respectively between the fourth magnetic cores, and a pair of erase gaps having a width equal to or smaller than the width of the write-read gap and provided between the pair of erase gaps. a spacer embedded in the grooves of the third and fourth magnetic cores to regulate the distance between the gaps; and grooves formed on both sides of the erasing magnetic head core to regulate the pair of erasing gaps to a predetermined width. and a pair of spacers embedded in the composite magnetic head.